public class Demo2 {

    public static void main(String[] args) {

        Object locker1 = new Object();
        Object locker2 = new Object();


        Thread t1 = new Thread(() -> {

            synchronized (locker1) {
                synchronized (locker2) {
                    try {
                        Thread.sleep(1000);
                        System.out.println("t1 jieshu");
                    } catch (InterruptedException e) {
                        throw new RuntimeException(e);
                    }
                }
            }
        });

        Thread t2 = new Thread(() -> {

            synchronized (locker2) {

                synchronized (locker1) {

                    try {
                        Thread.sleep(1000);
                        System.out.println("t2.jieshu");
                    } catch (InterruptedException e) {
                        throw new RuntimeException(e);
                    }
                }
            }
        });

        t1.start();
        t2.start();
    }
}
